A local Republican Party office in North Carolina has been damaged by fire and someone spray-painted an anti-GOP slogan referring to "Nazi Republicans" on a nearby wall, authorities said Sunday.

A news release from the town of Hillsborough said someone threw a bottle filled with flammable liquid through the window of the Orange County Republican Party headquarters overnight. The substance ignited and damaged furniture and the interior before burning out.

The news release says an adjacent building was spray-painted with the words: "Nazi Republicans leave town or else."

State GOP director Dallas Woodhouse says no one was injured, but a security alert is being sent to party offices around the state.